/*
 * Copyright (c) 2019-2020 The Linux Foundation. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all
 * copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef __HAL_RX_FLOW_H
#define __HAL_RX_FLOW_H

#include "hal_flow.h"
#include "wlan_cfg.h"
#include "hal_api.h"
#include "qdf_mem.h"
#include "rx_flow_search_entry.h"

#define HAL_FST_HASH_KEY_SIZE_BITS 315
#define HAL_FST_HASH_KEY_SIZE_BYTES 40
#define HAL_FST_HASH_KEY_SIZE_WORDS 10
#define HAL_FST_HASH_DATA_SIZE 37
#define HAL_FST_HASH_MASK 0x7ffff
#define HAL_RX_FST_ENTRY_SIZE (NUM_OF_DWORDS_RX_FLOW_SEARCH_ENTRY * 4)

/**
 * Four possible options for IP SA/DA prefix, currently use 0x0 which
 * maps to type 2 in HW spec
 */
#define HAL_FST_IP_DA_SA_PFX_TYPE_IPV4_COMPATIBLE_IPV6 2

#define HAL_IP_DA_SA_PREFIX_IPV4_COMPATIBLE_IPV6 0x0

/**
 * REO destination indication is a lower 4-bits of hash value
 * This should match the REO destination used in Rx hash based routing.
 */
#define HAL_REO_DEST_IND_HASH_MASK	0xF

/**
 * REO destinations are valid from 16-31 for Hawkeye
 * and 0-15 are not setup for SW
 */
#define HAL_REO_DEST_IND_START_OFFSET 0x10

/**
 * struct hal_rx_flow - Rx Flow parameters to be sent to HW
 * @tuple_info: Rx Flow 5-tuple (src & dest IP, src & dest ports, L4 protocol)
 * @reo_destination_handler: REO destination for this flow
 * @reo_destination_indication: REO indication for this flow
 * @fse_metadata: Flow metadata or tag passed to HW for marking packets
 */
struct hal_rx_flow {
	struct hal_flow_tuple_info tuple_info;
	uint8_t reo_destination_handler;
	uint8_t reo_destination_indication;
	uint32_t fse_metadata;
};

/**
 * enum hal_rx_fse_reo_destination_handler
 * @HAL_RX_FSE_REO_DEST_FT: Use this entry's destination indication
 * @HAL_RX_FSE_REO_DEST_ASPT: Use Address Search + Peer Table's entry
 * @HAL_RX_FSE_REO_DEST_FT2: Use FT2's destination indication
 * @HAL_RX_FSE_REO_DEST_CCE: Use CCE's destination indication for this entry
 */
enum hal_rx_fse_reo_destination_handler {
	HAL_RX_FSE_REO_DEST_FT = 0,
	HAL_RX_FSE_REO_DEST_ASPT = 1,
	HAL_RX_FSE_REO_DEST_FT2 = 2,
	HAL_RX_FSE_REO_DEST_CCE = 3,
};

/**
 * struct hal_rx_fst - HAL RX Flow search table context
 * @base_vaddr: Virtual Base address of HW FST
 * @base_paddr: Physical Base address of HW FST
 * @key: Pointer to 320-bit Key read from cfg
 * @shifted_key: Pointer to left-shifted 320-bit Key used for Toeplitz Hash
 * @max_entries : Max number of entries in flow searchh  table
 * @max_skid_length : Max search length if there is hash collision
 * @hash_mask: Hash mask to apply to index into FST
 * @key_cache: Toepliz Key Cache configured key
 */
struct hal_rx_fst {
	uint8_t *base_vaddr;
	qdf_dma_addr_t base_paddr;
	uint8_t *key;
#ifndef WLAN_SUPPORT_RX_FISA
	uint8_t  shifted_key[HAL_FST_HASH_KEY_SIZE_BYTES];
	uint32_t key_cache[HAL_FST_HASH_KEY_SIZE_BYTES][1 << 8];
#endif
	uint16_t max_entries;
	uint16_t max_skid_length;
	uint16_t hash_mask;
	uint32_t add_flow_count;
	uint32_t del_flow_count;
};

/**
 * hal_rx_flow_setup_fse() - Setup a flow search entry in HW FST
 * @fst: Pointer to the Rx Flow Search Table
 * @table_offset: offset into the table where the flow is to be setup
 * @flow: Flow Parameters
 *
 * Return: Success/Failure
 */
void *hal_rx_flow_setup_fse(struct hal_rx_fst *fst,
			    uint32_t table_offset,
			    struct hal_rx_flow *flow);

/**
 * hal_rx_flow_delete_entry() - Delete a flow from the Rx Flow Search Table
 * @fst: Pointer to the Rx Flow Search Table
 * @hal_rx_fse: Pointer to the Rx Flow that is to be deleted from the FST
 *
 * Return: Success/Failure
 */
QDF_STATUS
hal_rx_flow_delete_entry(struct hal_rx_fst *fst, void *hal_rx_fse);

/**
 * hal_rx_flow_get_tuple_info() - Retrieve the 5-tuple flow info for an entry
 * @hal_fse: Pointer to the Flow in Rx FST
 * @tuple_info: 5-tuple info of the flow returned to the caller
 *
 * Return: Success/Failure
 */
QDF_STATUS hal_rx_flow_get_tuple_info(void *hal_fse,
				      struct hal_flow_tuple_info *tuple_info);

/**
 * hal_rx_fst_attach() - Initialize Rx flow search table in HW FST
 *
 * @qdf_dev: QDF device handle
 * @hal_fst_base_paddr: Pointer to the physical base address of the Rx FST
 * @max_entries: Max number of flows allowed in the FST
 * @max_search: Number of collisions allowed in the hash-based FST
 * @hash_key: Toeplitz key used for the hash FST
 *
 * Return:
 */
struct hal_rx_fst *
hal_rx_fst_attach(qdf_device_t qdf_dev,
		  uint64_t *hal_fst_base_paddr, uint16_t max_entries,
		  uint16_t max_search, uint8_t *hash_key);

/**
 * hal_rx_fst_detach() - De-init the Rx flow search table from HW
 *
 * @rx_fst: Pointer to the Rx FST
 * @qdf_dev: QDF device handle
 *
 * Return:
 */
void hal_rx_fst_detach(struct hal_rx_fst *rx_fst, qdf_device_t qdf_dev);

/**
 * hal_rx_insert_flow_entry() - Add a flow into the FST table
 *
 * @hal_fst: HAL Rx FST Handle
 * @flow_hash: Flow hash computed from flow tuple
 * @flow_tuple_info: Flow tuple used to compute the hash
 * @flow_index: Hash index of the flow in the table when inserted successfully
 *
 * Return: Success if flow is inserted into the table, error otherwise
 */
QDF_STATUS
hal_rx_insert_flow_entry(struct hal_rx_fst *fst, uint32_t flow_hash,
			 void *flow_tuple_info, uint32_t *flow_idx);

/**
 * hal_rx_find_flow_from_tuple() - Find a flow in the FST table
 *
 * @fst: HAL Rx FST Handle
 * @flow_hash: Flow hash computed from flow tuple
 * @flow_tuple_info: Flow tuple used to compute the hash
 * @flow_index: Hash index of the flow in the table when found
 *
 * Return: Success if matching flow is found in the table, error otherwise
 */
QDF_STATUS
hal_rx_find_flow_from_tuple(struct hal_rx_fst *fst, uint32_t flow_hash,
			    void *flow_tuple_info, uint32_t *flow_idx);

/**
 * hal_rx_get_hal_hash() - Retrieve hash index of a flow in the FST table
 *
 * @hal_fst: HAL Rx FST Handle
 * @flow_hash: Flow hash computed from flow tuple
 *
 * Return: hash index truncated to the size of the hash table
 */
uint32_t hal_rx_get_hal_hash(struct hal_rx_fst *hal_fst, uint32_t flow_hash);

/**
 * hal_flow_toeplitz_hash() - Calculate Toeplitz hash by using the cached key
 *
 * @hal_fst: FST Handle
 * @flow: Flow Parameters
 *
 * Return: Success/Failure
 */
uint32_t
hal_flow_toeplitz_hash(void *hal_fst, struct hal_rx_flow *flow);

void hal_rx_dump_fse_table(struct hal_rx_fst *fst);
#endif /* HAL_RX_FLOW_H */
